Worksheet 732 · Skill 5

Set and drift

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1. At 0820 your fix is 043°T, 2.2 nm from Heron Point Light. You steer 338°T at 8.8 kn through the water. At 0850 a new fix puts you 055°T, 2.8 nm from Westfield church spire.

   Plot the 0850 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1510 your fix is 011°T, 1.2 nm from Kittle water tank. You steer 302°T at 4.0 kn through the water. At 1630 a new fix puts you 195°T, 1.8 nm from Tern Island tower.

   Plot the 1630 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0850 your fix is 282°T, 1.1 nm from Gannet Rock daybeacon. You steer 298°T at 4.5 kn through the water. At 1020 a new fix puts you 084°T, 3.7 nm from Westfield church spire.

   Plot the 1020 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1225 your fix is 155°T, 2.7 nm from Tern Island tower. You steer 287°T at 8.8 kn through the water. At 1300 a new fix puts you 276°T, 3.4 nm from Tern Island tower.

   Plot the 1300 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1030 your fix is 052°T, 2.8 nm from Heron Point Light. You steer 069°T at 4.3 kn through the water. At 1145 a new fix puts you 259°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1145 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1120 your fix is 244°T, 2.6 nm from Gannet Rock daybeacon. You steer 097°T at 6.0 kn through the water. At 1155 a new fix puts you 030°T, 2.1 nm from Kittle water tank.

   Plot the 1155 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0825 your fix is 040°T, 3.5 nm from Gannet Rock daybeacon. You steer 176°T at 4.7 kn through the water. At 0855 a new fix puts you 086°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0855 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1035 your fix is 075°T, 1.1 nm from Westfield church spire. You steer 115°T at 4.2 kn through the water. At 1145 a new fix puts you 232°T, 3.0 nm from Tern Island tower.

   Plot the 1145 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn